Agu, listed at 6-foot-1 and 240 pounds, played in seven games for Cal in 2013 and would've been a fifth-year senior this fall.

This from CBS Sports:

Cal team physician Dr. Casey Batten was on "a supervised training run" with the entire team and "multiple members of the medical staff in attendance." According to Batten, the medical staff witnessed Agu having trouble completing the run and removed him from it, putting him on a cart and taking him to the medical area. When Agu became unresponsive the staff performed CPR and called the emergency staff.

Agu was then taken to Alta Bates Medical Center in Berkeley where he was pronounced dead.

Unfortunately, tragedy is a part of life, and it's always difficult. But Agu essentially died while running at football practice, and spring practice no doubt will be tough on his teammates, who were running with him when he became distressed.

The Cal women's basketball team wore makeshift black bands with Agu's name around the right shoulder of their jerseys Friday night.